Future development of construction equipment for cement-concrete road pavement

The paper presents a circuit diagram of a shock-vibration mechanism for compacting mixtures of any stiffness (including extra stiff ones). Its operation principle is based on Archimedes’ lever and the thrust-bar system. This mechanism was designed and assembled at the department of Wheeled and Tracked Vehicles, SUSU. The first experimental tests of the shock-vibration mechanism were carried out there. The tests confirmed the technological capabilities and advantages of this mechanism in comparison with the vibratory compaction technology which is used by modern concrete pavers. The samples from a molding machine produced with poor quality sand and cement, coarse-grained crushed stone, and a small water ratio obtained the M100 grade strength. The tests revealed small defects in the design of the develop construction. Solutions for the elimination of these defects were outlined. One of the solutions is to install a special pusher that moves translationally to deliver the material to the pressing zone. Another solution is to upgrade the mechanism, namely to replace the thrust-bar system with a more perfect four-link mechanism which consists of a supercharger plate, a crank, and a pendulum. A circuit diagram of the four-link mechanism is given, and its operation principle, based on Archimedes’ lever and the four-link mechanism, is analyzed. In the course of the work, its mathematical model is described, and formulas for calculating the forces in the mechanism links and the working plate are given. Formulas for calculating gains, forces, drive power, angular velocity, moment of inertia, flywheel diameter, and rim area were derived. The necessary conditions for the successful operation of the new mechanism are described. Three-dimensional models of this mechanism and of all molding units were developed. As a result, conclusions were drawn, and a technical solution was proposed to modernize the molding unit, which consisted in replacing the articulation linkage of the existing pilot plant with an improved four-link mechanism.